MIPS: Use JIC/JIALC offset when possible

src/compiler/mips/code-generator-mips.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
@@ skipping 602 matching lines @@
     case kArchTailCallCodeObject: {
       if (arch_opcode == kArchTailCallCodeObjectFromJSFunction) {
         AssemblePopArgumentsAdaptorFrame(kJavaScriptCallArgCountRegister,
                                          i.TempRegister(0), i.TempRegister(1),
                                          i.TempRegister(2));
       }
       if (instr->InputAt(0)->IsImmediate()) {
         __ Jump(Handle<Code>::cast(i.InputHeapObject(0)),
                 RelocInfo::CODE_TARGET);
       } else {
-        __ addiu(at, i.InputRegister(0), Code::kHeaderSize - kHeapObjectTag);
-        __ Jump(at);
+        if (IsMipsArchVariant(kMips32r6)) {

[ivica.bogosavljevic, 2016/12/05 10:48:47]

Move to a common routine

+          __ Jump(i.InputRegister(0), Code::kHeaderSize - kHeapObjectTag);
+        } else {
+          __ addiu(at, i.InputRegister(0), Code::kHeaderSize - kHeapObjectTag);
+          __ Jump(at);
+        }
       }
       frame_access_state()->ClearSPDelta();
       frame_access_state()->SetFrameAccessToDefault();
       break;
     }
     case kArchTailCallAddress: {
       CHECK(!instr->InputAt(0)->IsImmediate());
       __ Jump(i.InputRegister(0));
       frame_access_state()->ClearSPDelta();
       frame_access_state()->SetFrameAccessToDefault();
@@ skipping 1669 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8